Friction brake



y 1930. J. s. THOMPSON 1,757,273

FRICTION BRAKE Filed March 18 1926 3 Sheets-Sheet l y 1930. J. 5. THOMPSON 1,757,273

FRICTION BRAKE Filed March 18, 1926 5 Sheets-Sheet 2 Sheet 3 FRICTION BRAKE N 0 s P M O H T. s l

Filed March 18 Patented May 6, 1930 UNITED STATFSPATENT OFFICE JAMES S. THOMPSON, OF NEW YORK, N. Y., ASSIGNOB T0 AMERICAN BILLS CORI PORATION, OF, NEW YORK, N. Y., A CORPORATION OF NEW YORK rmo'rron name Application filed. March is, 1926. Serial No. 95,602.

This invention relates to friction brakes and while it is particularly adapted for expanding brakes arranged to make frictional contact with a drum, which is a form of brake commonly employed in automotive vehicles, it is also useful in many other installations as will be apparent to those skilled in the art.

The object of the invention is to provide a brake assembly comprising a skeleton-head,

one or more detachable friction shoes, and means for securing each shoe on the head whereby the shoe may be easily installed and replaced and securely held in position on the head, the construction being such that ample ventilation iswprovided about the head and the shoe for quickly dissipating the heat of friction.

For the purposes of this application 'I have illustrated the invention in several embodiments for an expanding brake for automotive 5 vehicles in the accompanying drawings, and

referring thereto Figs. 1, 2 and 3 are elevations, partly in section, showing different dispositions of a single shoe upon a brake head. Fig.4: 1s an enlar ed sectional new showmg any one of the s oe dispositions of Figs. 1,2 and 3.

Fig. 5 is a plan view'of Fig. 4. I Fig. 6 is a detail perspective view. Fig. 7 is a sectional view on the line 7 -7 of Fig. 5. j

Fig. 8 is an elevation partly in section showing a head provided with three shoes. Fig. 9 is a plan view of Fig. 8. Fig. 10 is a detail .plan view partly in section. Y

Fig. 11- is a transverse sectional View on the line-1111 of Fig. 8.

Fig. 12 is a view similar to Fig. 8 with different fastenin means.

. Fig. '14 is a sectional ew on the line I l- 14.

of Fig. 12.

In Figs. 1-7 ofthe drawings the. head comprises an arm 1 mounted within a drum indic'ated by the broken line 2 andin this form .of the invention the head is provided with'an arcuate seat for a single shoe, whereas in Figs. 812 the heads 6 are provided with arcuate seats arranged endto end for a plurality of separate shoes. In Fig.1 the shoe seat section 3 is located adjacent the free end of the head; in Fig. 2 theshoe seat section 1 1s located approximately midway between the ends of the head; and in Fig. 3 the shoe seat section 5 is located adjacent the pivoted end of the head.

Each head is provided with an eye 7t0 engage a pivot stud of a brake assembly, and its other end'8 is free to be engaged by the means (not shown) wh 'chmay be employed for swinging the head on its pivot to move the shoe or shoes lateral projections 10 suitably spaced apart to provide seats for one or more shoes. Stops 11 are provided on the projections at the ends of the seats to form end stops for the shoe and these ends stops may be spaced from the ends of the projections, as shown in Figs. 5 and 13, or they may extend to the outside edges of the projections, as shown in Figs. 9 and 10. Side guides 12 are provided 'on the ends of the projections to engage the sides of the shoe. The end stops and the side guides are preferably located to snugly engage the ends and the sides of the shoe to position the shoe on the head and prevent endwise or lateral displacement thereof.' When the head is made to receive a plurality of shoes, it will be provided with a set of side guides for each shoe and aset of end stops for each shoe, but it will only be necessary to provide one set of end stops between the adjacent ends of two shoes. Shoulders 13 are provided on the heads adjacent the end stops to support the shoe sothat the back of the shoe will be free from the head except at its ends where it engages the shoulders.

' I provide theshoe with end projections to be engaged by devices for fastening the shoe on the head. I have found it desirable to use a composition shoeand to provide'it with a metal back 9', which may be made in the form of a shell, as shown. The shell may be cut at its ends to form projections 14, and these projections may be provided with openings in the form of a hole 15, Fig. 15, or an end slot 16, Fig. 16, or a side slot 17, Fig. 17.

Various means may be employed for fastening the shoe to the head. In Figs. 1-5 I have shown the shoe fastened to the head by 10 means of clamps 18 which overlap the projections 14 on the shoe and are secured in place by bolts 19. In Figs. 8-10 theouter ends of the outer shoes are secured by clamps 18, but the opposing. ends of adjacent shoes 15 have their projections 14 abutting and a double clamp 18 is arranged between the. ends of the shoes and overlaps the projections on both shoes. Separate clamps 18- may be ar-'- ran d between the shoes, if desired, but I pre er mass the double clamp 18' because it reduces the numberof parts and occupies less space. The clamps may be flat, but I prefer, to make theclamps 18 angular, as shown, to engageshoulders 20 on the head and ranged to have'its head engage the edge of the projection. The projections at the opposin ends of adjacent shoes may be overlappe as shown inFig. 12 so that a single b lt will engage two projections.

- The shoe is seated on the head between end stops and side guides and since it is desirable that the shoe should fit the seat comparative- I l snug there will be very little if any tend ency on the part of the shoe to move and wise or sidewise on the seat.- The fastening means'flare employed solely to prevent any tendency of the s oe to move outward from a. its seat. Under all conditions there will be very little if any tendency of the shoe to move outward from its seat and the means herein disclosed for fastening the shoe to its seat willbe am 1 'suflicientfor thep p y the form, cona I am aware that changes in jections at its ends, and detachable means en gaging said projections and the head for securing the shoe to the head.

3. The combination of a brake head, a .com-

position' friction shoe having a metal shell thereon, rojections at the back and ends of said shell said projections and the head for securing the shoe to the'head.

4. The combination of a brake head, a composition friction shoe having a metal back and detachable means engaging thereon, pro'ectionsat the ends of saidback, and detacha le means engaging said projections and the head the head.

5. The combinationof a brake head, a comosit'ion friction shoe seated on the head and aving a metal back thereon, integral rojections at the ends of said back exten ing for securing the shoe to 1 beyond the ends of the'body-of the shoe, and

detachable means engagingv said rejections ialnddthe head-for securing the s oe to the ea 1 Y l 6. The combination of a brake head, a fric-.

tion shoe seated on the head and. having a back thereon with projections at its ends, and v clamps securedto 1e head and engaging. said projections for securing the shoe, to the head.

7. The combination ofia brake head, a friction shoe seated on the head and having a back thereon with projections at its ends, angularcclamps engaging said projections, gnddmeans for securing the clamps to the ca 8. The combination of a brake head, a pair of friction shoes seated on thehead,'a shell on each shoe, projections on. the adjacent ends of said shells, and clampsfastened to the head over said rejections for. securing the shoes to the headi a 9. The combination of a brake head, a pair of friction shoes seated on the head and having projections on their opposing ends ar-.

ranged in abutting'relation, clamps overlapstruction and arrangement-of partsmay be i v I made withoutdeparting from the spiritor sacrific' the a vantages ofthe invention herein s forth and I-reserve the right to 'u makeallsuchchan .mfairlyfall withinthescopeofthefo owingclaims.-'

I claim: 1. The combination of a brakehead, a friction shoeseatedenthe headajdd having "ametal shell ther it'li, imiecti'ens fat the ,ends of the shell, and detac a'blelneans i :fiid projections and the head for securing e s I a' 2. The combination of a brake head, a fric- 1 II tion shoe seated on the head and having pro:

oetothehead. 

